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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream
Charles Murdock, Baltimore, Maryland · Public domain (expired patent)
Emma

Creado por

Emma

6. octubre 2026SE
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Trapped-Air Cylinder Dash Churn: A Hollow Dash That Squeezes Air Into the Cream

Murdock wanted the air carried down through the cream by the common up-and-down dash itself. Charles Murdock of Baltimore, Maryland, received US 6,133, dated 20 February 1849, for "Murdock's Atmospheric Churn": a hollow cylindrical dash, perforated round its lower open end, on the common dash staff, which is bored to slide over a fixed central spindle. The spindle stands in a stationary cylindrical block, smaller than the dash, held to the churn's bottom by a nut. At each stroke the dash fills with air above the cream, carries it down, and when it meets the block the air "is compressed in the cylinder forced radially through the apertures." This rung works out the air squeezed out each stroke, then prints the dash and block, fits them to a churn, and makes butter.
Principiante
About 2 hours, plus printing

Instrucciones

1

Air per stroke

Cargando el cuaderno de Jupyter…
2

An air pump in the churn before it

The embedded blueprint puts a pump and a ring dasher in the churn. Murdock makes the dash itself the pump.
3

Read US 6,133

"The air, however, may be let into the cylinder through a valve in its top or side instead of open end which will do away with the necessity of raising the cylinder above the surface of the cream to receive air. The aperture in the staff must be a little larger than the spindle but must not extend through it nor be intersected by any lateral opening."
4

Print the dash and block

Print the dash open end up: a 90 mm cylinder with sixteen small holes near its open edge and a socket for the staff. Print the block. Print in PETG at 0.2 mm layers, 30 % infill, 4 walls; wash before first use.

Materiales para este paso:

Filamento PETGFilamento PETG1 pieza

Herramientas necesarias:

Impresora 3D de filamento (FDM)Impresora 3D de filamento (FDM)
5

Print the dash

The dash, printed as step 4 describes.
Archivo de DisenoSTLCC0 - Free
Descargar modelo
6

Print the block

The block, printed as step 4 describes.
Archivo de DisenoSTLCC0 - Free
Descargar modelo
7

Spindle and block

Drill an 8 mm hole in the centre of a tall food-grade bucket's floor. Pass an M8 threaded rod up through it and the block, with a washer and nut under the floor and silicone round the hole, so the rod stands upright as the spindle.

Materiales para este paso:

Cubo de 20 litrosCubo de 20 litros1 pieza
Varilla roscadaVarilla roscada1 pieza
Tuerca hexagonalTuerca hexagonal1 pieza
Arandela planaArandela plana1 pieza
Sellador de siliconaSellador de silicona1 pieza

Herramientas necesarias:

Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
Llave inglesa ajustableLlave inglesa ajustable
Sierra para metalesSierra para metales
8

Staff and lid

Bore a 25 mm hardwood dowel lengthwise, 10 mm, deep enough to slide over the spindle's full height but not through its top, and glue the dash on its foot. Drill the lid for the staff and fit a knob on top.

Materiales para este paso:

Espigas de madera duraEspigas de madera dura1 pieza
Bloque de madera duraBloque de madera dura1 pieza
Cola de carpinteroCola de carpintero1 pieza

Herramientas necesarias:

Taladro inalámbricoTaladro inalámbrico
Juego de brocasJuego de brocas
SerruchoSerrucho
Papel de lijaPapel de lija
9

The build in 3D

FreeCAD model of this build, not of the patent: the churn and dash cut away to show the hollow dash with its holes near the open end, the bored staff over the fixed spindle, and the stationary block it closes over.
Archivo de DisenoBLENDCC0 - Free
Descargar modelo
10

Dash and make butter

Let the heavy cream stand until it reaches about 15 °C, checked with the thermometer. Pour in 1.5 litres. Work the staff up and down, lifting the dash above the cream each time to fill it with air; bubbles burst from the holes at the foot of each stroke. Time until the butter comes. Pour off the buttermilk, add cold water, churn a little and pour off again until it runs clear; work in a pinch of salt and weigh the butter.
Paso 10 - Image 1

Materiales para este paso:

Crema de leche espesaCrema de leche espesa1500 ml
Sal marina gruesaSal marina gruesa1 pieza
AguaAgua1 pieza

Herramientas necesarias:

Termómetro de sonda permanenteTermómetro de sonda permanente
CronómetroCronómetro
Báscula digital de cocinaBáscula digital de cocina
Bol grande de acero inoxidableBol grande de acero inoxidable
11

No bubbles, a staff that sticks

Trapped-air cylinder dash churn troubleshooting.

Flow

Loading...
12

History and honest limits

**Charles Murdock** of Baltimore, Maryland, received US 6,133, dated 20 February 1849, signed 21 November 1848. The dash could be formed in the underside of the dash block, or as a cylinder fixed to the dash's periphery; in a stone churn the spindle's hole could be drilled and bushed. He claimed the combination of the hollow perforated cylinder dash and the central guide spindle and stationary block with the ordinary upright tub churn. **Honest limits.** A bucket, threaded rod and printed parts stand in for his churn, spindle and dash. FDM prints hold food in their layer lines, so wash well and replace when worn. Your times and weights are the result.

Materiales

12

Herramientas requeridas

11

Archivos de diseño

3

Este plano hace

Thumbnail
Marcador

Mantequera

Free

19
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